You will find out anything you can--anything, mind, no matter how trivial or apparently irrelevant--in any way connected with him and enter it in this book." He wrote on the cover "Reuben Hornby" and passed the book to me.

"In this second book you will, in like manner, enter anything that you can learn about Walter Hornby, and, in the third book, data concerning John Hornby.

As to the fourth book, you will keep that for stray facts connected with the case but not coming under either of the other headings.

And now let us look at the product of Polton's industry." He took from his assistant's hand a photograph ten inches long by eight broad, done on glazed bromide paper and mounted flatly on stiff card.

It showed a greatly magnified _facsimile_ of one of the thumb-prints, in which all the minute details, such as the orifices of the sweat glands and trifling irregularities in the ridges, which, in the original, could be seen only with the aid of a lens, were plainly visible to the naked eye.